參數(shù)資料
型號(hào): XRT83SH38IB
廠商: EXAR CORP
元件分類: 數(shù)字傳輸電路
英文描述: 8-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT
中文描述: DATACOM, PCM TRANSCEIVER, PBGA225
封裝: 19 X 19 MM, 1 MM PITCH, PLASTIC, BGA-225
文件頁(yè)數(shù): 40/78頁(yè)
文件大?。?/td> 606K
代理商: XRT83SH38IB
XRT83SH38
37
8-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT
REV. 1.0.7
5.2.3
Receive Interface with 1:1 and 1+1 Redundancy
The receivers on the backup card should be programmed for "High" impedance. Since there is no external
resistor in the circuit, the receivers on the backup card will not load down the line interface. This key design
feature eliminates the need for relays and provides one bill of materials for all interface modes of operation.
Select the impedance for the desired mode of operation, T1/E1/J1. To swap the primary card, set the backup
card to internal impedance, then the primary card to "High" impedance. See
Figure 28
. for a simplified block
diagram of the receive section for a 1:1 redundancy scheme.
F
IGURE
28. S
IMPLIFIED
B
LOCK
D
IAGRAM
OF
THE
R
ECEIVE
I
NTERFACE
FOR
1:1
AND
1+1 R
EDUNDANCY
"High" Impedence
Internal Impedence
Backplane Interface
Primary Card
Backup Card
XRT83SH38
Rx
T1/E1 Line
Rx
1:1
1:1
XRT83SH38
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